The beautiful blue hues in the water really up make the subject pop out of the picture. The shadows and reflections in the water are absolutely beautiful. I like the high contrast of the bird. It makes the bird very graphic and dynamic. The direction and angle of the water helps give a sense of motion to the bird.
Nice color, but the seagull doesn't seem super sharp (or is it just a bit too far away and not very detailed). In between silhouetted and not. Is it me, or is the ocean slanted? 7 Rob the Swash
Focus is a little soft and the composition could be improved by off-centering the bird (to the right) to give more feeling of space, and the imminent arrival of the bird.
I like the light on the water, the dark shap of the bird. Wish the subject weren't dead center - perhaps with the bird more to the right and up we would feel the bird in flying into the space in front of it.
I like the silhoutte of the bird on the water. I personally don't like the fact that your subject is centered, I would try something a little of center.